Low frequency dielectric relaxation from complex impedance and complex electric ?modulus?

1979 ◽  
Vol 14 (8) ◽  
pp. 1945-1951 ◽  
Author(s):  
M. Tomozawa ◽  
J. Cordaro ◽  
M. Singh
Keyword(s):  
Dielectric Relaxation ◽  
Electric Modulus ◽  
Complex Impedance ◽  
Low Frequency ◽  
Complex Electric Modulus

scholarly journals Effect of Interfaces on Dielectric Relaxation in La0.35Sr0.6MnO3 -YSZ

2000 ◽  
Vol 53 (5) ◽  
pp. 715
Author(s):  
Xia Zheng-Cai ◽  
Tang Chao-Qun ◽  
Zhou Dong-Xiang ◽  
Yang Jian-Hui
Keyword(s):  
Dielectric Relaxation ◽  
Complex Impedance ◽  
Low Frequency ◽  
Impedance Spectra ◽  
Mass Rate ◽  
Relaxation Properties ◽  
Diffusion Phase ◽  
Mixed Ceramic ◽  
Complex Impedance Spectra ◽  
Dielectric Relaxation Properties

The perovskite structure material La 0.35 Sr 0.6 MnO 3 was sintered in air and the mixed ceramic of a 0.35 Sr 0.6 MnO 3 and 8 mol % Y 2 O 3 +ZrO 2 with a 1:1 mass rate was also sintered in air, both at 1530 K for 12 hour. The AC complex impedance spectra have been measured and the effect of the interface between La 0.35 Sr 0.6 MnO 3 and YSZ on dielectric relaxation properties of La 0.35 Sr 0.6 MnO 3 has been investigated. A schematic of diffusion phase formation and the equivalent circuits are proposed for explaining the results. In the complex impedance spectra, the first and second semicircles correspond to the grain-boundary and interface respectively. The results show that the dielectric relaxation properties and structure of the mixed ceramic are different to that of single phase La 0.35 Sr 0.6 MnO 3 . The interface has an important effect on the electric properties of the mixed ceramic and produces a dielectric relaxation in low frequency.

Complex electric modulus and dielectric relaxation of nanocrystalline zinc ferrite

2015 ◽  
Author(s):  
S. Choudhury ◽  
M. Sinha ◽  
M. K. Mandal ◽  
S. K. Pradhan ◽  
A. K. Meikap
Keyword(s):  
Dielectric Relaxation ◽  
Zinc Ferrite ◽  
Electric Modulus ◽  
Complex Electric Modulus

Dielectric Relaxation Studies of Silver Nanoparticles dispersed Liquid Crystal

2015 ◽  
Vol 8 (3) ◽  
pp. 2176-2188 ◽  
Author(s):  
Keisham Nanao Singh
Keyword(s):  
Activation Energy ◽  
Silver Nanoparticles ◽  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Relaxation Process ◽  
Relaxation Times ◽  
Low Frequency ◽  
Bulk Liquid ◽  
Molecular Rearrangement ◽  
Relaxation Studies

This article reports on the Dielectric Relaxation Studies of two Liquid Crystalline compounds - 7O.4 and 7O.6 - doped with dodecanethiol capped Silver Nanoparticles. The liquid crystal molecules are aligned homeotropically using CTAB. The low frequency relaxation process occurring above 1 MHz is fitted to Cole-Cole formula using the software Dielectric Spectra fit. The effect of the Silver Nanoparticles on the molecular dipole dynamics are discussed in terms of the fitted relaxation times, Cole-Cole distribution parameter and activation energy. The study indicate a local molecular rearrangement of the liquid crystal molecules without affecting the order of the bulk liquid crystal molecules but these local molecules surrounding the Silver Nanoparticles do not contribute to the relaxation process in the studied frequency range. The observed effect on activation energy suggests a change in interaction between the nanoparticles/liquid crystal molecules.

scholarly journals Dielectric relaxation and modulus spectroscopy analysis of (Na0.47 K0.47 Li0.06) NbO3 ceramics

2017 ◽  
Vol 07 (03) ◽  
pp. 1750020 ◽  
Author(s):  
Md Kashif Shamim ◽  
Seema Sharma ◽  
Sangeeta Sinha ◽  
Eqra Nasreen
Keyword(s):  
Dielectric Relaxation ◽  
Spectroscopic Analysis ◽  
Microwave Sintering ◽  
Complex Impedance ◽  
Tungsten Bronze ◽  
Negative Temperature ◽  
Nyquist Plot ◽  
Orthorhombic Symmetry ◽  
Modulus Spectroscopy ◽  
C Complex

We have investigated the structure, dielectric and electrical properties of lead-free polycrystalline (Na[Formula: see text] K[Formula: see text] Li[Formula: see text]) NbO3 ceramics as a function of temperature and frequency in order to understand the intrinsic contribution of grain/bulk and grain boundary effects toward the dielectric response as well as the electrical conduction mechanism in the samples fabricated by microwave sintering method. X-ray diffraction analysis exhibits perovskite structure with orthorhombic symmetry, which is well supported by the Raman spectroscopic analysis. A minor secondary impurity phase of tungsten bronze structure was observed for samples sintered at 1050[Formula: see text]C, which gets weaker for samples sintered at 1150[Formula: see text]C. Dielectric permittivity was enhanced by 50%, although there was a reduction in the dielectric loss by about 50% at Curie temperature (450[Formula: see text]C) for samples sintered at 1150[Formula: see text]C. Complex impedance spectroscopic analysis indicated non-Debye-type dielectric relaxation present in the samples, and this phenomenon followed thermally activated process related to hopping mechanism. Nyquist plot showed the negative temperature coefficient of resistance, characteristic of the samples.

Dielectric Relaxation at Ultra Low Frequency

2003 ◽  
Vol 294 (1) ◽  
pp. 3-11
Author(s):  
E. R. Neagu ◽  
J. N. Marat-Mendes ◽  
C. J. Dias
Keyword(s):  
Dielectric Relaxation ◽  
Low Frequency

Low-frequency dielectric relaxation of hematite and silica sols

Langmuir ◽  
1993 ◽  
Vol 9 (7) ◽  
pp. 1625-1633 ◽  
Author(s):  
Johan Kijlstra ◽  
Herman P. van Leeuwen ◽  
Johannes Lyklema
Keyword(s):  
Dielectric Relaxation ◽  
Low Frequency ◽  
Silica Sols
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